Plastering machine



3 Sheets-Sheet 1 Filed May 13. 1929 mm 19 Mild, 08 r M415 ATTORNEYS.

IN VEN TOR.

April 28, 1931. R. D, HOOD 1,802,945

" PLASTEJRING MACHINE .Filed May 13, 1929 3 Sheets-Sheet 2 Sun. 11:

1 VENTOR.

A TTORNEYS.

Filed May 13, 1929 3 Sheets-Sheet 3 3 w 9 2 & aw 7. 2 m. Z

ORNEYS.

Patented Apr. 28, 1931 PATENT FF-ice ROBERT 1). H001), or Saussure,CALIFORNIA rL s'rERING lvLeennvn Application filed May 13,

This invention relates to a plastering machine whereby plaster or mortaris adapted to be conveyed from a hopper through a flexible tube or, hoseto a trowel such as shown in my co-pending application entitled Mortarspreader filed April 29th, 1929, Serial Number 358,817, said trowelserving the function of applying and spreading the mortar over a surfaceto be plastered.

The object of the present invention is to generally'improve and simplifythe construction and operation of machines of the character described;to provide a portable machine which may be readily moved from place toplace asthe plastering work proceeds, thereby permitting the use of acomparatively short hose line at all times; to provide a feed hopper forthe reception of the mortar; to provide means for mixing the mortar andfor delivering it to the feed hopper; to provide a double acting plungerpump for delivering the mortar under pressure to the hose line and thetrowel; to provide means whereby the pump may be intermittently operatedas required; and further to provide means whereby the mortar isdelivered by gravity feed from the feed hopper to the pumps.

tion in the accompany ng which:

Fig. 1 is a side elevation of-the machine partially in section. andpartially broken away to show certain parts of the mechanism,

Fig. 2 is a plan view of the machine,

Fig. 3 is an end view, one of the cylinders of the pump and feed hopperbeing shown in section.

Referring to the drawings in detail, A indicates a main frame supportedby wheels or the like, as indicated at 2, to permit the machine to bemoved from place to place.

Mounted on the main frame, but not illustrated, is an engine from whichpower .is

The machine is shown way of illustra drawings, in

? transmitted to a drive shaft B. This shaft is provided with a clutch3, and power transmitted through the clutch to ashaft {.t, upon which ismounted a driving pinion 5, the clutch being thrown into and out of.operation by meansof a clutchlever fi.-.-Jour 1929. Serial No. 352,777.

nailed centrally of the main frame in bearings 7 and 8 is a shaft 9, andsecured thereon is a gear 10, a sprocket gear 11 and a driving pinionl2.Journalled in bearings 14, 15 and 16, which are mounted below the mainframe 5 is a shaft 17, and secured thereon is a spur gear 18 and asprocket gear 19. Thesprocket gear 19 is driven from the sprocket llthrough means of a chain 20, and as the driving pinion 5 meshes with thegear lOQpower will'be transmitted from the main drive shaft B throughgears 5 and 10, and sprocket chain 20 to the shaft 17. This shaftcarries a clutch 21 which is operated through means of a clutch lever22, henceshaft 17 may be thrown into or out of operationwheneverdesired. Supported journal members 23 is a shaft'upon which secured aspur gear 24c, see Fig. 3. This gear meshes with the spur gear 18 and isdriven thereby. The spur gear 24L is provided with two crank pins, oneon each side thereof. These crank pins are op posed to each other, andone of them is clearly shown at 25 Both crank pins exten d intocrosshead bearings '26 .which are slidably mounted on crank arms 27,these arms being pivotally supported at their u'pperfends with the mainframera s indicated at 28. Hence, during rotation of gear 24;. anoscillating movement will be transmitted to the crank arms 27 thisoscillating movement in turn being transmitted through links 28 topistons or plungers29 mounted'in cylinders 29a.

These cylinders are supported with Irelation-to the main framethroughmeans of brackets 30. Caps 31 are secured ,on the lower ends of thebrackets and these caps serve the funutionjot clamping and securing thecylinders which mana ble, will here inafter be described. "l V Mounteddirectly above thecylinders, and suitably supported with relation to themain frame,- is a feed hopperiwhich is generally in dicatedat G lsceFigsq2 and The mortar to be used is dumped into-this hopper and thebottom portion of the' Y pper ii mammacation withlthe -c yLi-Iiflers29throughisldts for such as showiiat 32an d 33f The mortar is, .iiithis'manner, fed by gravity into h espeevee li ss nd e sk s'rl e lisreciprocate back and forth the mortar admitted will be discharged in aforward direction through check valves, such as indicated at 34.

A manifold 35 connects the discharge end of the cylinders and receivesthe discharging mortar. The manifold terminates in a single connection,such as shown at 36 and the hose line (not here shown) is connectedtherewith. The machine shown in the present lnstancels also providedwith amixingapparatus whereby the mortar may be mixed previous to itsde- 3 livery to the feed hopper C. The mixing apparatus consists of ahopper or container, generally indicated at D. The container issupported by a shaft 37 journalled in bearings 38, which in turn aresupported on brackets or standards, such as indicated at 140. The shaft37 provided with arms ll, and hese are in turn provided with blades suchas shown at 42.

Shaft 37 is driven from shaft 9 through the pinion 12 and a largeintermeshing gear 12a secured on shaft 37. The arms 41 and the :lades 42serve as. agitators to thoroughly mix the mortar, and they are rotatedthrough the driving pinion5 and gear 10 which drives shaft 9. This inturn drives the pinion 12,

which int'ermeshes with the gear 120 and as his is secured on shaft 37continuous rotary motion will be transmitted to the agitator, saidmotion being, however, interrupted whenever the clutch 3 is disengagedby means of the lever 6. V i

The container D is normally secured in the upright position shown inFig. 3 by means of a locking latch, such as shown at 50, see Fig. 3.That is, a segmental shaped flange 51 is secured at one end of thecontainer and this is provided with recesses 52 and 53. Latch 5Onormally engages the recess 52 and thereby secures the container in itsnormal upright position. Latch50 is pivotally, mounted at the point 54-and .it is connected through means of a link 55 with a hand operatedlever 56. hen this lever is grasped and pulled in the direction of thearrow latch 50 is moved out of engagement with the notch 52. Thecontainer is thus released and if it is grasped y the handle 60 andpulled in the direction of arrow 1) it will be tilted to assume thedotted line position shown in Fig. 3, and it may be locked in thistilted position by latch 50 engaging the recess 53. V V f In thisposition of the container the mixed mortar is dumped or discharged intothe feeding hopper C, and when the dumping operation is completed it israised to a vertical position when new material may be added in theusual manner and mixed.

In actual operation, if power is being transmitted through the clutch 3to the driving pinion 5, it is obvious thatfth'e mixer will be inoperation, as it will be driven throughthe gears'5,10, 12'and 12111 Itis also obvious through the LEGS-3.94;)

cranks 27, and as theseare connected through links 28 with the plungers29 in the respective pump cylinders, mortar will be continuouslydischarged as it is supplied to the cylinders feed openings 32 and 33 bygravity feed.

A hose line, as previously stated, is connected with the manifold at thepoint 36 and the mortar will thus be continuously discharging underpressure through the hose line and the trowel connected therewith,andthe mortar may thus be rapidly applied and spread over a surface to beplastered, the particular construction of the trowel and the manner ofoperating the same being fully dis closed in my co-pending applicationalready refered to, the machine shown in this application being providedfor the purpose of delivering the mortar under pressure to the trowel. Ii

The machine as a Whole is simple, compact and substantial inconstruction. It is mounted on wheels, such as indicated at 2, and assuch may readily be moved from one position to another as the plasteringwork proceeds, thus reducing the amount of hose line required.

Plaster ormortar is a fairly abrasive material, and the cylinders inwhich the plungers 29 operate accordingly havea tendency to out out andwear fairly rapidly. It is for this reason important to provide astructure which permits removal and. renewal of the cylinders as quicklyand easily as possible, and it is also important to provide a cylinderwhich can be cheaply replaced.

By. referring to Figs. 1 and 3 it will be'n'oted that the cylinders arenothing more or less than a pair of tubes which are slotted near one endtopermit the mortar to be fed by gravity thereto, these tube-likecylinders being secured by the clamping caps 31. Hence,

if it is desired to replace a cylinder it ismerely necessary, to retractthe plungers and remove the caps 31. When this is done the new cylindermay be placed imposition, the plungers inserted and the caps applied.This is quickly and readily accomplished.

The clutch indicated at 21 is also an important feature, as it isnecessary to shut off the mortar supply to the trowel whenever changingfrom place toplace, or moving the trowel from one surface to another.This is instantly accomplished in the pres'ent'iinstance by merelypulling the clutch lever 22 to throw out'the clutch, andco11verselyswing-:

ing it in the opposite direction to throw the clutch into engagement.The moment the clutch is thrown out the plungers 29 stop reciprocatingand the mortar supply to the trowel is thus momentarily stopped.

While certain features of the present invention are more or lessspecifically described, I wish it understood that various changes may beresorted to within the scope of the appended claim, similarly, that themateinder having an opening formed therein near one end, a feed hopperin communication with said openings and adapted to deliver mortar bygravity through the openings into the cylinuers, a plunger in eachcylinder, said plungers uncovering the feed openings when they reach oneend of their stroke and conversely covering said feed openings so as todischarge the mortar delivered to the cylinders during reverse movement,a manifold connecting the discharge ends of the cylinders, a check valveinterposed between each cylinder and the manifold, a pair of rocker armspivotally supported at one end, a link between each rocker arm and eachplunger,

: a rotatin member, a pair of opposed crank pins on said member one oneach side there of, sliding journal members in each rocker arm andreceiving the crank pins whereby an oscillating movement is transmittedto each rocker arm and a reciprocating movement to each plunger, and adrive shaft through which power is transmitted to drive the crankmechanism.

ROBERT D. HOOD.

